JPS5958114A - Filter refreshing device of internal combustion engine - Google Patents

Abstract

PURPOSE:To refresh a filter stably and efficiently by disposing a microwave reflection plate and a microwave supply passage inside an exhaust pipe, further providing a microwave oscillator and selectively heating and burning particulates. CONSTITUTION:When the need for refreshing a filter 5 occurs, a microwave power supply 12 is electrified by another power supply to radiate microwave from a microwave oscillator 8. The radiated microwave passes through a microwave supply passage 7 to be supplied to the filter 5 inside a filter housing 4 and is then trapped inside it by a microwave reflection plate 6. The trapped microwave is selectively absorbed by the particulates which are collected by the filter 5. As a result, the particulates are heated to be burnt into carbon dioxide and discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention H1 1 “Particulates (P) in air gas
This article relates to a filter t'J generation device 1k for an internal smoking engine that removes articutatel f.

Various devices of this type have been studied in the past, one of which is shown in Figure O1. In Figure 1, 11) is the diesel engine, (2) is the exhaust manifold attached to this diesel engine il+, (3) is the exhaust pipe connected to the exhaust manifold (2), and 14) is the exhaust pipe (3). In the middle, there is a filter housing that is part of the lido trachea (3). (5) V
J:, filter stored in filter storage container (4), (
9) is the exhaust manifold (2) and filter storage container (4)
A filter regeneration burner (ilO) installed in the exhaust pipe (3) between the filter regeneration burners (9)
(11) is an air pump that supplies combustion air to the filter regeneration burner (9).

Next, the operation will be explained. diesel engine fi+
The particulates in the exhaust gas discharged by When particulates accumulate in the filter (5) to a certain extent, the pressure in the exhaust manifold 12) increases, which worsens the fuel efficiency of the diesel engine IL+, so the filter (5) must be regenerated at this time. Must be. Generally, the main component of particulates is carbon, whose temperature is #'iso.

It is around ℃. Therefore, in some way, the temperature of the filter (5) where particulates are accumulated is reduced to 500°C.
Given the above, the regeneration of the filter (5) is i'' possible.

In Fig. 1, the fuel is combusted in the burner (9), the combustion exhaust gas is mixed with the engine exhaust gas, and the temperature of the engine exhaust gas is lowered to 500°C or higher, thereby raising the temperature of the filter (5) simultaneously. The filter (51) is regenerated. That is, the fuel supplied by the F P+ pump (10) and the combustion air supplied by the viewing pump (II) are mixed and combusted in the total burner (9). Warm combustion waste is produced and sent to the engine exhaust gas in the exhaust pipe (3) to regenerate the filter (5).

Since the conventional mounting is constructed as described above, it has the following drawbacks.

High pressure (usually 0.8.
4 or higher) and a large flow rate (usually 1001 Aln or higher), an air pump (11) and a Keiko pump (101) are required.

(2) Since the exhaust pressure fluctuates depending on the engine operating conditions, it is necessary to adjust the air pressure and fuel pressure by 1 lil n11.

(Due to fluctuations in air pressure of 31υ, combustion within the burner (9) becomes unstable and it is difficult to regenerate the filter (5) stably.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it includes a microwave reflecting plate cut into the exhaust pipe so as to sandwich a filter that beams particulates, and this reflecting plate. It is equipped with a microwave supply path that supplies microwaves into the exhaust pipe sandwiched between JIIJ's purpose is to provide a filter regeneration device 4 for an inner core engine that regenerates filters stably and efficiently.

An embodiment of the present invention will be explained below with reference to the drawings.

In FIG. 2, (7) is a microwave I branched into the filter housing 14) which is a part of the exhaust pipe (3).
JIi Tsumugi 1 [°6, (8) is microwave supply path +71
An example of a microwave oscillator equipped with K is a magnetron. +121 is a microphone IJ wave power source for driving the microwave oscillator (8), and (6) is a microwave reflecting plate for confining the microwave in the filter housing 141.

The previous work is as follows. When it is necessary to regenerate the filter (5), my own mouth wave tk source (121 and other +li source 1)
1 and N (not shown), and a microwave is emitted from the microwave oscillator (8). The radiated microwaves are supplied to the filter (5) in the filter housing (41) through the microwave supply path (7), and the microwave reflection plate (6) causes the VC inside the filter housing (4) to be supplied to the filter (5).
IiI can be locked in. trapped microwave tit
Filter (6) vζ dyed particulate VC
1 is selectively absorbed, and as a result, the particulates are heated and burned to become carbon dioxide and are emitted.

In the above embodiment, the microwave supply path (7) equipped with the microwave oscillator (8) is connected to the filter housing (41), and microwave reflectors (6) are provided before and after the filter (6). However, the microwave supply path (7) is connected to an arbitrary location of the exhaust pipe (3), and the microwave supply path (
7) and the microwave reflector (5) in between.
6) provides a similar moving bed.

Further, it is convenient to use a mesh as the microwave reflector (6) because the microwave can be confined between the reflectors (6) without interfering with the flow of IJl gas.

In addition, as the microwave supply path (7), a coaxial cable that can be freely bent may be used as the microwave supply path (7).

Claims (1)

[Claims] +11 A microwave reflecting plate placed in an exhaust pipe so as to sandwich a filter that collects particulates, and a microwave supply path that supplies microwaves to the exhaust pipe sandwiched by this reflecting plate. and a microwave generator installed in the microwave supply path. (21) The filter regeneration device for an internal combustion engine according to claim 1, wherein the microwave reflecting plate is made of a metal mesh.